DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input [08/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   Result	Proceed to
   P0102 is output	A
   P0103 is output	B

Result: 

B 

See step  5

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter assembly connector.
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C27-1 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Mass Air Flow Meter)

Result: 

NG 

See step  7

Result: 

OK 

See step  3

1. Disconnect the mass air flow meter assembly connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C27-3 (VG) - C29-14 (VG)	Always	Below 1 Ω
   C27-2 (E2G) - C29-13 (E2G)	Always	Below 1 Ω
   C27-3 (VG) or C29-14 (VG) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Inspect the mass air flow meter assembly (Refer to PROCEDURE - Step 1 ).

   HINT: 

   Perform "Inspection After Repairs" after replacing the mass air flow meter assembly (Refer to INITIALIZATION [08/2015 - ] ).

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPLACE MASS AIR FLOW METER ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

1. Disconnect the mass air flow meter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C27-2 (E2G) - Body ground	Always	Below 1 Ω

   HINT: 

   Perform "Inspection After Repairs" after replacing the mass air flow meter assembly (Refer to INITIALIZATION [08/2015 - ] ).

Result: 

OK 

REPLACE MASS AIR FLOW METER ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

See step  6

1. Disconnect the mass air flow meter assembly connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C27-3 (VG) - C29-14 (VG)	Always	Below 1 Ω
   C27-2 (E2G) - C29-13 (E2G)	Always	Below 1 Ω
   C27-3 (VG) or C29-14 (VG) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the mass air flow meter assembly connector.
2. Remove the No. 1 integration relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C27-1 (+B) - 1B-4	Always	Below 1 Ω
   C27-1 (+B) or 1B-4 - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE ECM POWER SOURCE CIRCUIT 

(Refer to ECM Power Source Circuit [08/2015 - 08/2019] , or refer to ECM Power Source Circuit [08/2019 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR